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Table 1 Characteristics of participants of the SAPALDIA cohort according to the completion of the HRQL instruments

From: Comparing a disease-specific and a generic health-related quality of life instrument in subjects with asthma from the general population

  AQLQ
Group A*
AQLQ + SF36
Group B*
No AQLQ, no SF36
Group C*
Age, years ± SD 48.7 ± 14.0 47.2 ± 14.2 49.3 ± 15.5
Male gender, % 49.2 47.5 45.7
BMI, ± SD 22.3 ± 6.0 22.4 ± 6.3 20.9 ± 8.5
Low level of education, % 19.1 19.0 14.2*
Current smokers, % 17.2 17.6 27.2
Formers smokers, % 31.7 33.5 33.3
Never smokers, % 50.8 48.9 37.0
Cough, % 20.2 16.7 27.2§
Phlegm, % 15.3 12.2 19.8
Wheeze, % 60.7 57.0 51.9
Dyspnea, % 24.0 21.7 18.5
Depression,% 12.2 12.7 13.0
Exercise limitation, % 24.8 24.3 8.6
GP visits, % 34.7 33.9 27.8
Lung specialist visits, % 16.4 14.5 8.0¥
FVC, % of predicted value ± SD 94.9 ± 14.6 96.5 ± 13.3 94.7 ± 15.0
FEV1, % of predicted value ± SD 85.3 ± 19.7 87.1 ± 18.4 90.2 ± 16.5
FEF25–75, % of predicted value ± SD 69.8 ± 32.1 71.1 ± 30.8 81.7 ± 26.8
Use of asthma medication during last 3 months,% 38.8 32.5 12.3
Number of asthma attacks in last 12 months, median (25th to 75th percentile) 3 (1–12) 3 (1–12) 3 (1–10)
Number of asthma attacks in last 3 months, median (25th to 75th percentile) 2 (1–7) 2 (1–6) 2 (1–4)
  1. Group A: Participants who had completed the Asthma quality of life questionnaire (AQLQ) only; group B: participants who had completed the AQLQ and the short-form 36 questionnaire (SF36); group C: participants who had not completed the AQLQ nor the SF36.
  2. BMI: body mass index; GP: general practitioner; FVC: forced vital capacity; FEV1: forced expiratory volume at one second; FEF25–75: forced expiratory flow measured between 25% and 75% of the forced vital capacity. *p = 0.01 and p < 0.05 compared to groups A and B, respectively; p = 0.01 and p < 0.05 compared to groups A and B, respectively; p < 0.01 and p < 0.05 compared to groups A and B, respectively;§p = 0.01 compared to group B; p < 0.0001 compared to groups A and B;¥p = 0.01 and p = 0.05 compared to groups A and B, respectively.